Basic Syntax in Ruby Data Types and Variables in Ruby Operators in Ruby Control Structures in Ruby Arrays, Hashes and Strings in Ruby Methods in Ruby Classes and Objects in Ruby Object Oriented Programming (OOP) Concepts in Ruby Inheritance and Polymorphism in Ruby Modules and Mixins in Ruby Exception Handling in Ruby File Input Output in Ruby Regular Expressions in Ruby Blocks and Procs in Ruby Enumerators and Iterators in Ruby Ruby Gems Working with Dates and Times in Ruby Testing in Ruby (RSpec, MiniTest, etc.) Best Practices and Code Conventions in Ruby Advanced Topics in Ruby